Definition
The phase of takeoff during which the aircraft accelerates along the runway from the start of the takeoff run until it lifts off the surface. Also called the ground run.
Plain English
The part of takeoff where the aircraft is still on the runway, speeding up, before the wheels leave the ground.
Context Anchor
You will see this term in tower instructions, takeoff clearances, accident reports, and runway performance discussions.
Derivation
‘Roll’ here describes the aircraft rolling along the runway on its wheels. The term simply names the rolling portion of the takeoff, before the aircraft becomes airborne.
Why Pilots Care
Determines the runway length needed and affects decisions about weight, wind, and runway conditions.
Intuition Check
Do not read “roll” here as an aircraft rolling left or right in the air. In “takeoff roll,” it means the aircraft is moving along the ground at the start of takeoff.
Example Sentence 1
On a hot day at a high-elevation airport, the takeoff roll was noticeably longer than usual.
Example Sentence 2
Strong headwinds reduce the takeoff roll distance required to reach rotation speed.